Neptunium redox behavior and sorption onto goethite and hematite in the presence of humic acids with different hydroquinone content

The effect of humic acids (HA) on neptunium redox behavior and sorption onto hematite, α-Fe 2O 3, and goethite, α-FeOOH, colloids was established in batch sorption experiments that were carried out in broad pH interval. The sorption isotherms were provided for two samples of HA: commercial sample of...

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Bibliographic Details
Published in:Journal of alloys and compounds 2007-10, Vol.444, p.491-494
Main Authors: Khasanova, A.B., Kalmykov, St.N., Perminova, I.V., Clark, S.B.
Format: Article
Language:English
Subjects:
Humic acids
Neptunium
Surfaces and interfaces
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Summary:The effect of humic acids (HA) on neptunium redox behavior and sorption onto hematite, α-Fe 2O 3, and goethite, α-FeOOH, colloids was established in batch sorption experiments that were carried out in broad pH interval. The sorption isotherms were provided for two samples of HA: commercial sample of leonardite humic acid and its hydroquinone-enriched derivative obtained using formaldehyde copolycondensation. The distribution of Np fitted the distribution of hydroquinone-enriched HA at low pH values in case of both solids while the influence of parent HA on Np sorption was negligible. This is due to Np(V) reduction upon interaction with hydroquinone-enriched derivative having higher reducing capacity compared to the parent HA. The order of components addition was found to be significant for Np retention.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2007.02.069